After playing The Flash for ten years to great success, Grant Gustin’s time as Barry Allen shows that Andy Muschietti’s arguments to defend The Flash movie’s box office issues are wrong. The DCEU had quite a few movies that underperformed over the last year of the franchise. In 2023, after James Gunn and Peter Safran had already announced the DCU’s Chapter One, the comic book giant released Shazam! Fury of the Gods, The Flash, Blue Beetle, and Aquaman and the Lost Kingdom. None of those films ended up being among the DCEU’s best movies or became a box office hit.

https://screenrant.com/the-flash-movie-box-office-reason-grant-gustin-arrowverse-op-ed/